Performance of Pre-Weaned Dairy Calves under Hot Arid Environment: Effects of Immunoglobulins and Age on Diseases and Mortality | Science Publications

American Journal of Applied Sciences

S. Abbas¹  M. Bedair¹  M. A. Razzaque¹  T. Al-Mutawa¹ 

关键词: Dairy calves;    mortality;    morbidity;    colostrum;    immunoglobulin;   

DOI  :  10.3844/ajassp.2009.1885.1891

学科分类：自然科学（综合）

来源: Science Publications

【 摘 要 】

Problem statement: A high mortality rate (crude mortality 43.6%) of pre-weaned dairy calves resulted in unavailability of replacement heifers in Kuwait. Dairy producers resorted to import pregnant heifers for herd replacement. This study was undertaken to investigate the effects of dam vaccination and age, serum Immunoglobulin (Ig) on disease syndromes and mortality in pre-weaned calves. Approach: Late pregnant Holstein Friesian dairy cows and heifers of five commercial dairy operations were divided into two herds: Treatment (T) vaccinated using Lactovac against Rotavirus, Coronavirus and Escherichia coli and Control (C) unvaccinated herds. Total of 1,088 newborn calves of above herds were also divided as T and C for studies from their birth to weaning at 90 days. Calves weighed at birth, fed colostrum, serum proteins and Ig (IgG, IgM and IgA) were determined; disease syndromes, morbidity and mortality rates were investigated. Results: Mean birth weight (34.25

【 授权许可】

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